A fast convergent and accurate temperature model for phase-change heat conduction. (English) Zbl 0942.76038

Fachinotti, Víctor D.; Cardona, Alberto; Huespe, Alfredo E.

Int. J. Numer. Methods Eng. 44, No. 12, 1863-1884 (1999).

Summary: This work proposes a temperature-based finite element model for transient heat conduction involving phase change. Like preceding temperature-based models, it is characterized by the discontinuous spatial integration over the elements affected by the phase change. Using linear triangles or tetrahedrals, integration can be performed in a closed analytical way, assuring an exact evaluation of the discrete balance equation. Because of its unconditional stability, an Euler-backward time-stepping scheme is implemented. A crucial fact is the computation of the exact tangent matrices for the Newton-Raphson solution of the nonlinear system of discretized equations. Efficiency of the model is tested by means of the results obtained for the Neumann problem and for the solidification of a steel ingot.

MSC:

76M10	Finite element methods applied to problems in fluid mechanics
76T10	Liquid-gas two-phase flows, bubbly flows
80A22	Stefan problems, phase changes, etc.
80A20	Heat and mass transfer, heat flow (MSC2010)

Keywords:

analytical integration; solidification of steel ingot; temperature-based finite element; discontinuous spatial integration; Euler-backward time-stepping scheme; tangent matrices; Newton-Raphson solution; Neumann problem

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